The Aqua Lung Sport Quantum Stretch Fullsuits are highly flexible making them exceptionally comfortable. Made of 3mm super stretch neoprene. 3mm skin-out super stretch neoprene chest panel. Skin-in neoprene seals at wrists and ankles. Comfort neck panel in women's model. Custom Aqua Lung Sport zipper leash. No. 10 YKK non-corrosive zipper.